CN115058785B - Radiation refrigeration composite fiber and fabric for water collection and preparation method thereof - Google Patents
Radiation refrigeration composite fiber and fabric for water collection and preparation method thereof Download PDFInfo
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- CN115058785B CN115058785B CN202210752793.7A CN202210752793A CN115058785B CN 115058785 B CN115058785 B CN 115058785B CN 202210752793 A CN202210752793 A CN 202210752793A CN 115058785 B CN115058785 B CN 115058785B
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- Prior art keywords
- radiation refrigeration
- fiber
- composite fiber
- water collection
- preform
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- 239000000835 fiber Substances 0.000 title claims abstract description 160
- 230000005855 radiation Effects 0.000 title claims abstract description 122
- 239000002131 composite material Substances 0.000 title claims abstract description 112
- 238000005057 refrigeration Methods 0.000 title claims abstract description 108
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 239000004744 fabric Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000002105 nanoparticle Substances 0.000 claims abstract description 18
- 229920001477 hydrophilic polymer Polymers 0.000 claims abstract description 13
- 238000004049 embossing Methods 0.000 claims abstract description 12
- 229920000307 polymer substrate Polymers 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 10
- 230000004048 modification Effects 0.000 claims abstract description 5
- 238000012986 modification Methods 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 35
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 28
- 238000007731 hot pressing Methods 0.000 claims description 15
- 239000000243 solution Substances 0.000 claims description 14
- 239000004408 titanium dioxide Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 8
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 8
- 239000004626 polylactic acid Substances 0.000 claims description 8
- 239000011259 mixed solution Substances 0.000 claims description 7
- 229920001690 polydopamine Polymers 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 5
- 229950005499 carbon tetrachloride Drugs 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 238000002310 reflectometry Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 8
- 238000001816 cooling Methods 0.000 abstract description 2
- -1 Polyethylene Polymers 0.000 description 15
- 238000009833 condensation Methods 0.000 description 12
- 230000005494 condensation Effects 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 8
- 239000004698 Polyethylene Substances 0.000 description 7
- 238000001125 extrusion Methods 0.000 description 7
- 238000012681 fiber drawing Methods 0.000 description 7
- 230000002209 hydrophobic effect Effects 0.000 description 7
- 229920000573 polyethylene Polymers 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- 229910052581 Si3N4 Inorganic materials 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 5
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 description 4
- 229920002125 Sokalan® Polymers 0.000 description 4
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 4
- 239000004584 polyacrylic acid Substances 0.000 description 4
- 239000004926 polymethyl methacrylate Substances 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 4
- 229910010271 silicon carbide Inorganic materials 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 238000005491 wire drawing Methods 0.000 description 4
- 239000011787 zinc oxide Substances 0.000 description 4
- 238000010146 3D printing Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 229920001187 thermosetting polymer Polymers 0.000 description 3
- 238000009941 weaving Methods 0.000 description 3
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 2
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 2
- 125000002777 acetyl group Chemical class [H]C([H])([H])C(*)=O 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- GZCKIUIIYCBICZ-UHFFFAOYSA-L disodium;benzene-1,3-dicarboxylate Chemical compound [Na+].[Na+].[O-]C(=O)C1=CC=CC(C([O-])=O)=C1 GZCKIUIIYCBICZ-UHFFFAOYSA-L 0.000 description 2
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000009940 knitting Methods 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002715 modification method Methods 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 229920001485 poly(butyl acrylate) polymer Polymers 0.000 description 2
- 229920001490 poly(butyl methacrylate) polymer Polymers 0.000 description 2
- 229920001483 poly(ethyl methacrylate) polymer Polymers 0.000 description 2
- 229920002492 poly(sulfone) Polymers 0.000 description 2
- 229920002239 polyacrylonitrile Polymers 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 229920005862 polyol Polymers 0.000 description 2
- 150000003077 polyols Chemical class 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 2
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 2
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000012815 thermoplastic material Substances 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000007983 Tris buffer Substances 0.000 description 1
- 239000005083 Zinc sulfide Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 229960003638 dopamine Drugs 0.000 description 1
- 238000010041 electrostatic spinning Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229920006327 polystyrene foam Polymers 0.000 description 1
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000009965 tatting Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/92—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
- D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
- D03D15/292—Conjugate, i.e. bi- or multicomponent, fibres or filaments
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/32—Polyesters
Abstract
The invention provides a radiation refrigeration composite fiber, a radiation refrigeration fabric and a preparation method thereof. The preparation method of the radiation refrigeration composite fiber comprises the following steps: mixing inorganic micro-nano particles with a polymer substrate material to obtain a composite material; processing the composite material into a fiber preform; and performing hot drawing on the fiber preform to obtain the radiation refrigeration composite fiber. According to the preparation method, the inorganic micro-nano particles are used for doping, so that the cooling effect is improved to the greatest extent, the solar radiation wave band has high reflectivity, the infrared wave band has high emissivity, and the solar radiation refrigerating performance is excellent; according to the invention, hydrophilic polymer is utilized to carry out hydrophilic modification on the radiation refrigeration composite fiber with the surface microstructure obtained by hot drawing and hot embossing, so as to obtain super-hydrophilic radiation refrigeration composite fiber and fabric thereof; the fiber woven product has excellent water collecting capacity and excellent mechanical performance.
Description
Technical Field
The invention relates to the technical field of radiation refrigeration, in particular to a radiation refrigeration composite fiber and fabric for water collection and a preparation method thereof.
Background
The atmosphere can be considered a large, renewable reservoir that can serve as a water source anywhere on the earth. The water content in the air was estimated to be 14000 km 3 While the amount of fresh water on earth is about 1200 km 3 . Dew is a water droplet formed by condensation of atmospheric water vapor at surfaces below the dew point temperature. Dew can be regarded as an unconventional water source and can be exploited in areas where climatic conditions are conducive to dew condensation, insufficient water supply and general problems with water quality. Although potentially extractable fresh water is significant in many areas where weather conditions favor dew formation, existing dew collection systems are generally prone to the disadvantage of low water collection efficiency, indicating dew collection is an underdeveloped alternative to providing quality water. A radiation type (also called passive type) dew collection system is a mainstream dew collection system that collects dew using a physical process of producing dew without any additional energy input.
The radiation refrigeration technology can enable an object to achieve high reflectivity in the wavelength range of 0.3-2.5 mu m of solar radiation through material selection and structural design, and heat input through solar radiation is greatly blocked; high emissivity is realized in the wave band of 8-13 mu m in the atmospheric window, so that the heat radiation loss of the object is maximized, and the aim of reducing the temperature is fulfilled. By adopting the technology, the collection efficiency of the radiation dew collection system can be greatly improved.
In view of the wide application prospect, searching for surface materials of radiation dew collection systems with better performance has been a focus of attention of researchers and engineers. For example, the prior art discloses dew collection with Polyethylene (PE) foil. However, because the polyethylene itself has high transmittance in the infrared band, the refrigeration principle needs to have high emissivity in the infrared band on the surface to be refrigerated itself, and it is difficult to efficiently realize radiation refrigeration. In addition, polyethylene has certain hydrophobicity, and compared with a hydrophilic material, the larger contact angle of the polyethylene prevents the nucleation process of dew condensation and influences the dew collection effect. For example, the prior art also discloses the use of titanium dioxide (TiO 2 ) The white paint is mainly coated on polyvinyl chloride (PVC) foil, so that the paint is greatly improvedThe radiation refrigeration performance is high. Although titanium dioxide (TiO 2 ) The emissivity in the infrared region is very high, but the whole band atmosphere window of 8-13 μm cannot be completely covered. The prior art also discloses a vapor capture device comprising a wavy vapor condensation surface. The water vapor condensation surface takes hydrophobic radiation refrigeration material Polytetrafluoroethylene (PTFE) as a substrate; the bulge of the wavy water vapor condensation surface is a hydrophilic bulge, and is obtained by covering a substrate with hydrophilic materials such as nano silicon dioxide, metal or glass; the low concave part is a hydrophobic low concave part, namely a substrate body; the working principle is that water vapor captured by the hydrophilic bulge part forms water drops, and then the water drops are transferred to the hydrophobic concave part and are transferred to the water storage device along the hydrophobic concave part. The water vapor condensation surface has a simple structure, and simultaneously attempts to solve the problems of radiation refrigeration and dew transmission, but lacks preference for hydrophilic materials and radiation refrigeration materials, and further improvement exists. And the whole wave-shaped water vapor condensation surface is of a rigid structure, has larger mass, is complex in arrangement and structure, and is not suitable for large-scale preparation.
In summary, the condensation surface material of the existing radiation dew collection system has difficulty in combining excellent radiation refrigeration performance and hydrophilicity, and has complex rigid structure arrangement and difficult maintenance. Therefore, a preparation technology of super-hydrophilic radiation refrigeration fibers is lacking, excellent radiation refrigeration performance and hydrophilicity are achieved, meanwhile, good mechanical properties are achieved, and textiles suitable for showing condensation are prepared.
Disclosure of Invention
In view of the above, the present invention provides a radiation refrigeration composite fiber and fabric for water collection, and a preparation method thereof, so as to solve or partially solve the problems existing in the prior art.
In a first aspect, the present invention provides a method for preparing a radiation refrigeration composite fiber for water collection, comprising the steps of:
mixing inorganic micro-nano particles with a polymer substrate material to obtain a composite material;
processing the composite material into a fiber preform;
performing hot drawing on the fiber preform to obtain the radiation refrigeration composite fiber for water collection;
wherein the polymeric substrate material is a thermoplastic material;
the inorganic micro-nano particles comprise titanium dioxide, silicon dioxide, zinc oxide, silicon carbide, silicon nitride, silicon oxide, silicon nitride, silicon carbide, silicon nitride, silicon carbide, silicon nitride,
At least one of zinc sulfide, aluminum oxide, magnesium oxide, iron oxide, boron nitride, barium sulfate, barium carbonate and aluminum silicate.
Preferably, the polymer substrate material comprises at least one of polyethylene terephthalate, polyethylene, polyvinyl chloride, polyacrylonitrile, polypropylene, polyamide, polystyrene, polymethyl methacrylate, polyphenylene sulfide, polybutylene terephthalate, polyether ether ketone, polysulfone, polycarbonate, polyvinylidene fluoride, polybutyl acrylate, polyacrylic acid, polyethyl methacrylate, sodium isophthalate sulfonate copolymer, acrylic ester copolymer, polypropylene terephthalate, polyvinyl alcohol, fluorine resin modified polymethyl methacrylate, vinyl acetate resin, polyvinyl acetal, polyimide and polybutyl methacrylate.
Preferably, in the preparation method of the radiation refrigeration composite fiber for water collection, the fiber preform is subjected to hot drawing to obtain the radiation refrigeration composite fiber for water collection, wherein the hot drawing temperature is 25-600 ℃, and the tension is 0-500 g.
Preferably, the preparation method of the radiation refrigeration composite fiber for water collection, and the specific method for processing the composite material into the fiber preform comprises one of a hot pressing method, a sleeving method, a film winding method, a thermosetting method, a melt extrusion method, 3D printing and mechanical polishing cutting.
Preferably, the preparation method of the radiation refrigeration composite fiber for water collection further comprises hot embossing the surface of the fiber preform before hot drawing the fiber preform to obtain the fiber preform with the surface microstructure.
Preferably, the preparation method of the radiation refrigeration composite fiber for water collection further comprises the step of carrying out hydrophilic modification on the obtained radiation refrigeration composite fiber for water collection by using a hydrophilic polymer solution after carrying out hot drawing on a fiber preform to obtain the radiation refrigeration composite fiber for water collection, wherein the hydrophilic polymer comprises at least one of polydopamine, polyacrylic acid, polyvinyl alcohol, polyurethane, polyethylene glycol, polyether polyol and polyvinylpyrrolidone.
Preferably, in the preparation method of the radiation refrigeration composite fiber for water collection, the particle size of the inorganic micro-nano particles is 0.01-30 μm, and the doping concentration of the inorganic micro-nano particles in the composite material is 0.1-50 vol.%.
Preferably, in the preparation method of the radiation refrigeration composite fiber for water collection, the mass concentration of the hydrophilic polymer solution is 0.1-50%.
Preferably, in the preparation method of the radiation refrigeration composite fiber for water collection, the diameter of the radiation refrigeration composite fiber for water collection is 1-3000 μm.
In a second aspect, the invention also provides a radiation refrigeration composite fiber fabric, which is obtained by processing the radiation refrigeration composite fiber for water collection prepared by the preparation method.
The preparation method of the radiation refrigeration composite fiber for water collection has the following beneficial effects compared with the prior art:
1. according to the preparation method of the radiation refrigeration composite fiber for water collection, disclosed by the invention, inorganic micro-nano particles such as titanium dioxide, silicon dioxide and zinc oxide are used for doping, so that the cooling effect is improved to the greatest extent, the radiation refrigeration composite fiber has high reflectivity in a solar radiation wave band and high emissivity in an infrared wave band, and the radiation refrigeration performance is excellent day and night;
2. according to the preparation method of the radiation refrigeration composite fiber for water collection, disclosed by the invention, the radiation refrigeration composite fiber for water collection with a surface microstructure obtained by hot drawing and hot embossing is subjected to hydrophilic modification by utilizing a hydrophilic polymer, so that the super-hydrophilic radiation refrigeration composite fiber and the fabric thereof are obtained; the composite fiber with various complex surface microstructures can be prepared by combining hot drawing and direct hot embossing technologies; the fiber woven product has excellent radiation refrigeration performance and hydrophilic capacity, good mechanical property, large-area weaving, simple preparation and controllable cost, and is suitable for industrial mass production. The manufacturer can finish the fiber design of different surface microstructures according to the target requirement. The preparation method is simple, can continuously prepare in a large scale, is suitable for industrial amplification application, and can design different materials according to actual needs.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic view of a thermal drawing apparatus used in the present invention;
FIG. 2 is a physical diagram of the radiation refrigeration composite fiber fabric prepared in the embodiment 1 of the present invention;
FIG. 3 is a schematic cross-sectional view of a radiation refrigerating composite fiber for water collection prepared in example 1 of the present invention;
FIG. 4 is a schematic surface view of a radiation refrigerating composite fiber for water collection prepared in example 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
The following description of the embodiments of the present invention will be made in detail and with reference to the embodiments of the present invention, but it should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
The embodiment of the application provides a preparation method of a radiation refrigeration composite fiber for water collection, which comprises the following steps:
s1, mixing inorganic micro-nano particles with a polymer substrate material to obtain a composite material;
s2, processing the composite material into a fiber preform;
s3, performing hot drawing on the fiber preform to obtain the radiation refrigeration composite fiber for water collection;
wherein the polymer substrate material is a thermoplastic material;
the inorganic micro-nano particles comprise titanium dioxide, silicon dioxide, zinc oxide, silicon carbide, silicon nitride and sulfur
At least one of zinc oxide, aluminum oxide, magnesium oxide, iron oxide, boron nitride, barium sulfate, barium carbonate and aluminum silicate.
In some embodiments, the inorganic micro-nano particles and the polymer substrate material are chemically dissolved and mixed and/or physically blended to obtain the composite material, for example, the inorganic micro-nano particles and the polymer substrate material may be mixed by mechanical stirring, or the inorganic micro-nano particles may be added into the solvent first, after being stirred uniformly, the polymer substrate material is added, and then the mixture is continuously stirred uniformly, and then the solvent is removed by evaporation, so that the inorganic micro-nano particles and the polymer substrate material may be mixed.
In some embodiments, the polymeric substrate material comprises at least one of polyethylene terephthalate, polyethylene, polyvinyl chloride, polyacrylonitrile, polypropylene, polyamide, polystyrene, polymethyl methacrylate, polyphenylene sulfide, polybutylene terephthalate, polyetheretherketone, polysulfone, polycarbonate, polyvinylidene fluoride, polybutyl acrylate, polyacrylic acid, polyethyl methacrylate, sodium isophthalate sulfonate copolymer, acrylate copolymer, polytrimethylene terephthalate, polyvinyl alcohol, fluororesin modified polymethyl methacrylate, vinyl acetate resin, polyvinyl acetal, polyimide, polybutyl methacrylate.
In some embodiments, the fiber preform is thermally drawn to obtain a radiant refrigeration complex for water collection
And (3) synthesizing the fiber, wherein the hot drawing temperature is 25-600 ℃, and the tension is 0-500 g. Specifically, the thermal fiber drawing temperature needs to be selected according to the physicochemical properties of the composite material, the fiber drawing temperature is 25-600 ℃, and the preferred fiber drawing temperature is 230-400 ℃; specifically, the fiber drawing tension range is 0-500 g, and the fiber drawing tension range is 10-50 g; the feeding speed of the preform ranges from 0.01 mm/min to 10mm/min, and the feeding speed of the preform ranges from 0.3 mm/min to 3 mm/min; the fiber drawing speed ranges from 0.1 to 5000m/min, and the preferable fiber drawing speed ranges from 0.1 to 20m/min.
In some embodiments, specific methods of processing the composite material into a fibrous preform include one of hot pressing, sleeving, film winding, thermosetting, melt extrusion, 3D printing, and mechanical polishing cutting.
Specifically, the hot pressing time of the hot pressing method for pressing the preform is 5-500 minutes, and the hot pressing is preferred
The time is 10-20 minutes; the pressure intensity of the hot pressing method for pressing the preform is 1-50 MPa, and the preferable hot pressing pressure intensity is 10-20 MPa, and the more preferable hot pressing pressure intensity is 15 MPa. The temperature for extruding the fiber preform by the melt extrusion method should be set with reference to the glass transition temperature of the substrate, the extrusion temperature is 50-600 ℃, and the preferred extrusion temperature is 200-300 ℃. The curing time of the fiber preform manufactured by the thermosetting method is 1-500 minutes, and the preferable curing time is 20-40 minutes. The temperature for preparing the fiber preform by 3D printing is set with reference to the glass transition temperature of the substrate, the extrusion temperature is 50-600 ℃, and the preferred extrusion temperature is 200-300 ℃.
In some embodiments, prior to hot drawing the fiber preform, hot embossing the surface of the fiber preform to produce a fiber preform having a surface microstructure is also included. Specifically, the surface microstructure pattern includes at least one of a one-dimensional structure, a two-dimensional structure, a three-dimensional structure, a periodic pattern, and an aperiodic pattern. In particular, the specific shape of the surface microstructure may be determined according to the actual situation. In particular, hot embossing may be performed on a cross-section or side of the fiber preform to form a surface microstructure.
In some embodiments, after the fiber preform is thermally drawn to obtain the radiation refrigeration composite fiber for water collection, the method further comprises hydrophilically modifying the obtained radiation refrigeration composite fiber for water collection with a hydrophilic polymer solution, wherein the hydrophilic polymer comprises at least one of polydopamine, polyacrylic acid, polyvinyl alcohol, polyurethane, polyethylene glycol, polyether polyol, and polyvinylpyrrolidone.
Concretely, the hydrophilic modification method comprises a soaking method, a spraying method, an electrostatic spinning method, a grafting modification method,
One or more of the gel methods are combined, preferably a soaking method and a spraying method. For example, the soaking method is specifically: immersing the obtained radiation refrigeration composite fiber for water collection into a hydrophilic polymer solution to obtain the super-hydrophilic radiation refrigeration composite fiber with the hydrophilic polymer uniformly coated.
In some embodiments, the particle size of the inorganic micro-nano particles is 0.01-30 μm, preferably 0.03-10 μm, and the doping concentration of the inorganic micro-nano particles in the composite material is 5-30 vol.% (volume concentration), preferably 8-15 vol.%.
In some embodiments, the hydrophilic polymer solution has a mass concentration of 0.1 to 50%, preferably 20 to 40% by weight.
In some embodiments, the diameter of the radiation refrigeration composite fiber for water collection prepared as described above ranges from 1 to 3000 μm, preferably from 10 to 500 μm.
In some embodiments, the cross-section of the fiber preform and the radiation chilled composite fiber for water collection comprises at least one of a circular, triangular, rectangular, polygonal, star-shaped, and the like irregular shape.
Specifically, referring to fig. 1, a schematic drawing of a fiber preform for hot drawing is shown, the fiber preform 1 is clamped in a preform clamp 2, the position of the preform clamp 2 is adjusted to align the preform with the center of a wire drawing tower heating furnace 3, the preform is inserted into the heating furnace 3, a preform softening stub bar is dropped when the temperature of the heating furnace 3 rises to 25-600 ℃, the fiber preform sequentially passes through a fiber calliper 5, a customized wire drawing tower tension detection device 6, an auxiliary traction wheel 7 and a last wire drawing drum 8, and then the radiation refrigeration composite fiber 9 for water collection is obtained.
Referring to fig. 1 again, the fiber preform further comprises a hot embossing roller 4, and the surface microstructure is formed by hot embossing the fiber preform by the hot embossing roller 4 before passing through the fiber calliper 5. Specifically, the side of the fiber preform 1 is hot-pressed by the hot-embossing roller 4 is shown in fig. 4.
Based on the same inventive concept, the embodiment of the application also provides a radiation refrigeration composite fiber fabric, which is obtained by processing the radiation refrigeration composite fiber for water collection prepared by the preparation method, specifically, the radiation refrigeration composite fiber fabric is obtained by processing the radiation refrigeration composite fiber for water collection by at least one of warp knitting, weft knitting, tatting and other methods, and the weave structure of the radiation refrigeration composite fiber fabric is at least one or more of plain weave, twill weave, satin weave, jacquard weave and the like. Specifically, weaving by adopting warp yarns and weft yarns to obtain the radiation refrigeration composite fiber fabric, wherein at least one of the warp yarns and the weft yarns adopts the radiation refrigeration composite fiber prepared by the method.
The radiation and refrigeration composite fibers and radiation and refrigeration composite fiber fabrics for water collection of the present application are further described in the following specific examples.
Example 1
A method for preparing radiation refrigeration composite fiber for water collection, comprising the following steps:
s1, adding 12g of titanium dioxide particles into 400ml of tetrachloromethane, and uniformly stirring to obtain a mixture
A solution;
s2, placing the mixed solution in the step S1 on a heating table of a magnetic stirrer for heating and stirring, and then adding
22 g polylactic acid until the particles are completely dissolved, so as to obtain a polylactic acid and titanium dioxide mixed solution;
s3, coating the polylactic acid and titanium dioxide mixed solution obtained in the step S2 into a film by using a scraper, and drying
Crushing into powder, and drying in an oven to remove solvent tetrachloromethane to obtain a composite material of polylactic acid and titanium dioxide (15 vol.%);
s4, placing the composite material in the step S3 into a die, wherein the die is a square cylinder groove with the length of 25mm multiplied by 100mm (namely, the length and the width of the die are 25mm and the height of the die is 10 mm), placing the die between an upper heating plate and a lower heating plate of a hot press, setting the hot pressing temperature to be 170 ℃, setting the hot pressing pressure to be 15 MPa, and hot-pressing the composite material into a square solid rod with the side length of 25mm and the length of 100 mm; cutting the square solid rod by using a lathe to prepare a twenty-pointed star-shaped (cross-section-shaped) fiber preform with the inner diameter of 16 mm, the outer diameter of 20mm and the length of 90 mm, wherein the star-shaped recess is in a regular triangle shape (i.e. a microstructure formed on the cross section);
s5, clamping the fiber preform in the step S4 in a preform clamp, adjusting the position of the preform clamp to enable the preform to be aligned with the center of a heating furnace of a drawing tower, and inserting the preform into the heating furnace; when the heating furnace of the wire drawing tower is heated to 332 ℃, the softening stub bar of the preform falls off, so that the fiber sequentially passes through a fiber diameter measuring instrument, a tension detection device, an auxiliary traction wheel and a last take-up reel, the rod feeding speed is controlled to be 0.2 mm/min under proper tension of 20 g, and the uniform radiation refrigeration composite fiber with the diameter and the outer diameter of 500 mu m for water collection can be obtained by adjusting the traction speed;
s6, immersing the radiation refrigeration composite fiber for water collection prepared in the step S5 into a polydopamine solution for 24 hours, and drying to obtain the super-hydrophilic radiation refrigeration composite fiber; the preparation method of the polydopamine solution comprises the following steps: the dopamine monomer was dissolved in tris/hcl buffer (ph=8.5, concentration: 1.3 mg/mL, commercially available) to give polydopamine solution.
The embodiment of the application also provides a preparation method of the radiation refrigeration composite fiber fabric, which comprises the following steps:
and weaving the prepared super-hydrophilic radiation refrigeration composite fiber serving as weft yarns and weft yarns to obtain the radiation refrigeration composite fiber fabric.
A physical diagram of the radiation refrigeration composite fiber fabric prepared in example 1 is shown in FIG. 2.
Testing the fabric made of the super-hydrophilic radiation refrigeration composite fiber
The average weighted emissivity of the band of 8-13 mu m in the atmospheric window is 92.39%, the highest weighted emissivity is 95.89%, the average weighted reflectivity of the band of 0.4-2.5 mu m in the solar band is about 86.8%, the highest reflectivity is 91.1%, and the radiation refrigeration effect is excellent. Meanwhile, the axial contact angle and the transverse contact angle of the fiber are close to 0 degrees, and the fiber has extremely excellent super-hydrophilicity.
Example 2
The preparation method of the radiation refrigeration composite fiber for water collection provided by the embodiment of the application is implemented in the same way
Example 1, except that in step S4, a fiber preform having a circular cross-sectional shape was prepared by cutting using a lathe; in step S5, the fibers were passed through a hot embossing roller before passing through a fiber calliper, and the rest of the process was the same as in example 1.
The preparation process of the radiation refrigeration composite fiber fabric provided by the embodiment of the application is the same as that of the embodiment 1.
The average weighted emissivity of the radiation refrigeration composite fiber fabric prepared in the embodiment 2 in the atmospheric window is 92.56 percent, the highest weighted emissivity is 95.31 percent, the average weighted reflectivity in the solar wave band, namely the wave band of 0.4-2.5 mu m is about 86.5 percent, the highest reflectivity is 91.8 percent, and the radiation refrigeration composite fiber fabric has excellent radiation refrigeration effect. Meanwhile, the axial contact angle and the transverse contact angle of the fiber are close to 0 degrees, and the fiber has excellent super-hydrophilicity.
Example 3
The preparation method of the radiation refrigeration composite fiber for water collection provided by the embodiment of the application is the same as that of the embodiment 1, except that the hydrophilic treatment of the step S6 is not performed, and the rest processes are the same as those of the embodiment 1.
The preparation process of the radiation refrigeration composite fiber fabric provided by the embodiment of the application is the same as that of the embodiment 1.
A schematic cross-sectional view of the radiation refrigerating composite fiber for water collection prepared in example 1 is shown in fig. 3; a schematic surface view of the radiation refrigerating composite fiber for water collection prepared in example 2 is shown in FIG. 4.
In fig. 3, 20 is a radiation refrigeration composite fiber body for water collection, and 21 is a hydrophilic coating layer formed by polydopamine.
The surface (specifically, the side) of the radiation refrigeration composite fiber for water collection prepared in fig. 4 has a microstructure.
The average weighted emissivity of the radiation refrigeration composite fiber fabric prepared in the embodiment 3 in an atmospheric window, namely a wave band of 8-13 mu m is 94.37%, the highest weighted reflectivity is 98.46%, and the average weighted reflectivity in a solar wave band, namely a wave band of 0.4-2.5 mu m is about 88%, and the highest reflectivity is 92.4%, so that the radiation refrigeration composite fiber fabric has an excellent radiation refrigeration effect. At the same time, the axial and transverse contact angles of the fiber are about 140 degrees, and the fiber is hydrophobic.
Example 4
The preparation method of the radiation refrigeration composite fiber for water collection provided by the embodiment of the application is the same as that of the embodiment 1, except that in the steps S1-S3, the titanium dioxide particles are not doped, and the rest processes are the same as that of the embodiment 1.
The preparation process of the radiation refrigeration composite fiber fabric provided by the embodiment of the application is the same as that of the embodiment 1.
The radiation refrigeration composite fiber fabric prepared in the embodiment 4 has the weighted emissivity of 10.5% and up to 11.1% in the atmospheric window, namely the 8 μm-13 μm wave band, and the weighted reflectivity of about 8% in the solar wave band, namely the 0.4 μm-2.5 μm wave band, and the highest reflectivity of 11% and has poor radiation refrigeration effect. At the same time, the axial and transverse contact angles of the fiber are about 0 degrees, and the fiber is hydrophilic.
Example 5
The preparation method of the radiation refrigeration composite fiber for water collection provided by the embodiment of the application is different from that of the embodiment 1 in that in the step S4, a fiber preform with a circular cross section is prepared by using lathe cutting, and the rest processes are the same as those of the embodiment 1.
The preparation process of the radiation refrigeration composite fiber fabric provided by the embodiment of the application is the same as that of the embodiment 1.
The average weighted emissivity of the radiation refrigeration composite fiber fabric prepared in the embodiment 5 in an atmospheric window, namely a wave band of 8-13 mu m is 92.77%, the highest weighted reflectivity is 95.87%, and the average weighted reflectivity in a solar wave band, namely a wave band of 0.4-2.5 mu m is about 87%, the highest reflectivity is 91.1%, and the radiation refrigeration composite fiber fabric has excellent radiation refrigeration effect. At the same time, the axial and transverse contact angles of the fiber are both about 30 degrees, and the fiber is hydrophilic.
The radiation refrigeration composite fiber fabrics prepared in examples 1 to 5 were tested for hydrophilic and hydrophobic angles and dew collection qualities, and the results are shown in table 1. The method for measuring the dew collection content comprises the following steps: first, the prepared fabric was placed on an insulating polystyrene foam having an inclination angle of 30 ° to the ground. A container is then placed under the fabric to collect dew falling down from the fabric. And finally, judging the dew collection capacity of the fabric by calculating the dew weight in the container after 24 hours.
TABLE 1 hydrophilic-hydrophobic Angle and dew collection quality of radiation refrigeration composite fiber fabrics prepared in different examples
| Examples | Hydrophilic and hydrophobic Properties | Dew collection Property (kg/24 h/m) 2 ） |
| Example 1 | 0° | 1.0 |
| Example 2 | 0° | 0.9 |
| Example 3 | 140° | 0.3 |
| Example 4 | 0° | 0.2 |
| Example 5 | 30° | 0.5 |
As can be seen from Table 1 above, the dew collection performance of the fabric is significant as the hydrophilic performance of the fabric is improved
Lifting, which indicates that the surface hydrophilic interface can reduce nucleation barriers in dew condensation process; hydrophilic fibers with microstructures on the fiber surface can significantly improve dew collection capacity, and the reason for the above results is that: the fiber surface microstructure can rapidly lead out and collect dew condensed on the surface of the fiber fabric, reduce the duration of the dew attached to the surface of the fabric and enhance the dew collection capacity; the fiber fabric with excellent radiation refrigeration performance has better dew collection capacity, which shows that reducing the surface temperature of the fabric through radiation refrigeration can obviously improve dew condensation efficiency, and simultaneously, reducing the absorption of sunlight radiation by the fabric in the early morning can also increase dew collection time and enhance dew collection capacity.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (3)
1. A method for preparing radiation refrigeration composite fiber for water collection, which is characterized by comprising the following steps:
mixing inorganic micro-nano particles with a polymer substrate material to obtain a composite material;
processing the composite material into a fiber preform;
performing hot drawing on the fiber preform to obtain the radiation refrigeration composite fiber for water collection;
the inorganic micro-nano particles are titanium dioxide;
the preparation method of the composite material comprises the following steps:
s1, adding 12g of titanium dioxide particles into 400ml of tetrachloromethane, and uniformly stirring to obtain a mixed solution;
s2, placing the mixed solution in the step S1 on a heating table of a magnetic stirrer for heating and stirring, and then adding
22 g polylactic acid until the particles are completely dissolved, so as to obtain a polylactic acid and titanium dioxide mixed solution;
s3, coating the polylactic acid and titanium dioxide mixed solution obtained in the step S2 into a film by using a scraper, and drying
Crushing into powder, and drying in an oven to remove solvent tetrachloromethane to obtain a composite material of polylactic acid and titanium dioxide;
the concrete method for processing the composite material into the fiber preform is a hot-pressing method, and the hot-pressing time of the hot-pressing method for pressing the preform is 10-20 minutes; the pressure intensity range of the hot pressing method for pressing the preform is 10-20 MPa;
carrying out hot drawing on the fiber preform to obtain the radiation refrigeration composite fiber for water collection, wherein the hot drawing temperature is 230-400 ℃, the tension is 10-50 g, and the feeding speed of the preform ranges from 0.3 mm/min to 3 mm/min;
the cross sections of the fiber preform and the radiation refrigeration composite fiber for water collection are in a twenty-pointed star shape, and the star-shaped concave part is in a regular triangle shape;
or, the cross section of the fiber preform is circular, and before the fiber preform is hot drawn, the method further comprises hot embossing the surface of the fiber preform to obtain the fiber preform with the surface microstructure;
after the fiber preform is thermally drawn to obtain the radiation refrigeration composite fiber for water collection, the method further comprises the step of carrying out hydrophilic modification on the obtained radiation refrigeration composite fiber for water collection by using a hydrophilic polymer solution, wherein the hydrophilic polymer is polydopamine;
the mass concentration of the hydrophilic polymer solution is 0.1-50%;
the particle size of the inorganic micro-nano particles is 0.01-30 mu m.
2. The method for preparing a radiation refrigeration composite fiber for water collection according to claim 1, wherein the diameter of the radiation refrigeration composite fiber for water collection is 1-3000 μm.
3. The radiation refrigeration composite fiber fabric is characterized in that the radiation refrigeration composite fiber fabric for water collection is prepared by adopting the preparation method of any one of claims 1-2.
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